(b)
Apply wax parting agent to area surrounding damage. Do not allow wax to contact cut edge in decorative sheet (from above item a).
(c)
Fill damaged area to 1/8 inch from decorative surface, with the following resin Fiber Resin No. 5-418S or 5-419S - 100 parts by wt. Fiber Resin Hardener No. 5-40A - 12 to 13 parts by wt.
(d)
Allow to cure until surface is firm. Temperatures up to 140°F may be used to cure resin.
(e)
Fill remaining void with the following resin tinted to match color.
Resin No. 5-418S or 5-419S - 100 parts by wt.
Fiber Resin Hardener No 5-40A - 12-13 parts by wt.
Color match using above white resin and an epoxy color
matching kit from Fiberlay, Inc. or equivalent.
Aug 15/76 25-00-11
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(f)
Place embossed Mylar over resin, refer to Repair Method No. 5. Use plain Mylar if surface being repaired is not embossed. Mylar shall be . inch to 1 inch larger in size than damaged area. Working from center of repair, resin shall be swept and faired to desired contour, using a rigid phenolic or Teflon squeegee held perpendicular to the decorative surface.
NOTE: It is very important that as much as possible of excess resin be swept out from beneath Mylar film.
(g)
Optional method of embossing mylar or Tedlar sweep fairing film.
1) Place a piece of 2 or 3 mil mylar or Tedlar over decorative surface of 6 inch x 8 inch piece of Tedlar-Conolite laminate or other decorative material of same texture as that to be repaired.
2) Place this between two 1/8 inch thick sheets of silicone rubber (Mosite 1440, or
equivalent). 3) Place Item 2, build-up between two pieces of .060 inch thick aluminum. 4) Place this in a press having platen temperatures of 340±10°F. Pressurize to 190
to 200 psi and hold for 7 to 10 minutes. Cool to less than 100°F under pressure and remove embossed film.
(h)
Allow resin to cure at temperatures of 70-140°F and then remove sweep fairing film.
(j)
If necessary, sand edges flush with decorative surface using 600 grit abrasive paper. (Andrew Brown Epoxy enamel System per BMS 10-11, Type 2, may be used for color and gloss matching, if desired.)
X. Repair Method No. 22
(1)
General
(a) This method is used to repair cuts and scratches and other surface damage in decorative perforated acoustical panels.
(2)
Equipment and Material
(a)
Drill (0.027 ±.002 inch dia.)
(b)
Drilling Template
(c)
Decorative Material
(3)
Repair: (Surface Touchup)
(a) Repair Procedure
1) Determine type of decorative material that is to be repaired. Locate this type of material and repair surface damage per any method listed under Type I for that decorative material.
2) Perforations may be restored by drilling using 0.027 ±.002 inch diameter drill. Use piece of perforated material as a drilling template.
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25-00-11 Page 232 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/76
Y. Repair Method No. 23
(1)
General
(a) Repair method in item (3) (a) 1) is used for deglossing small shiny spots in surface of a Tedlar laminate. this repair is limited to glossy spots less than 1/2 inch in the maximum dimension. Not more than six glossy spots shall be deglossed per panel and minimum spacing between glossy spots shall be one inch. Repair method in item
(3) (a) 2) is used for repair of scuffs and scratches that do not penetrate the Tedlar.
(2)
Equipment and Materials
(a)
Scotch Brite, Abrasive disc, type A
(b)
Sandpaper (600 grit)
(c)
Buffing Wheel (Cotton Flannel)
(d)
Buffing Compound, Learock S-30 or 888
(3)
Repair: (Abrading and Polishing)
(a) Repair Procedure
1) Glossy spots may be deglossed by light rubbing with a Scotch Brite abrasive disc, Type A, made by Minnesota Mining & Manufacturing Company or equivalent. Do not abrade through Tedlar.
2) Scuffs and scratches that do not penetrate Tedlar may be repaired as follows: Remove burrs of Tedlar by very light sanding with 600 grit or emery paper. do not sand through Tedlar. Polish to match gloss using a cotton flannel buffing wheel and Learock S-30 or 888 buffing compound.
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